JP6824136B2 - Cooker - Google Patents

Description

The present invention relates to a cooking device and relates to a cooking device that detects the weight of an object to be heated (food) and heats it.

In the known technique known in Patent Document 1, for an object to be heated placed on a square table plate, the table plate is supported by three weight sensors in order to detect the weight of the object to be heated, and the sum of the detected values. It is a heating cooker that uses an infrared sensor to detect the temperature of the object to be heated.

Japanese Unexamined Patent Publication No. 2016-205655

The cooking cooker shown in Patent Document 1 has a problem of high cost because a plurality of weight sensors are required to detect the weight of the object to be heated (tableware).

The present invention has been made to solve the above problems, and is provided at the bottom of the heating chamber, a heating chamber for storing the object to be heated, a range heating means having a magnetron for heating the object to be heated, and the above. a rectangular table plate for placing an object to be heated, and three support portions for supporting the table plate, wherein a weight sensor for detecting the weight of the object to be heated, provided above the heating chamber the object to be An infrared sensor that detects the temperature of the heated object in a non-contact manner, an operation unit that selects the range heating means and inputs heating conditions, and a display unit that displays the contents input from the operation unit and the progress of cooking. an input means having, and a control means for controlling the range heating means from the detection result of the infrared sensor and the weight sensor in accordance with an input from said input means, said supporting portion, said object to be heated The support portions provided at the left and right end portions, which are arranged at the left and right corner portions on the front side and the central portion on the rear side, which are the doors to be taken in and out, do not have the weight sensor, and are provided in the central portion. with the weight sensor to the support portion, the control means replaces the central position of the resulting detected temperature by Ri before Symbol object to be heated before Symbol infrared sensor to the center of gravity of the heated object, detected by the weight sensor The weight of the object to be heated is calculated from the applied load value and the position of the center of gravity .

According to the present invention, in order to detect the weight of an object to be heated placed on a table plate, it is possible to detect using an infrared sensor and two or less weight sensors, and a heating cooker capable of reducing costs can be provided. Can be provided.

The front perspective view of the cooking apparatus which concerns on embodiment of this invention. The rear perspective view which removed the outer frame of the cooking apparatus which concerns on embodiment of this invention. A cross-sectional view taken along the line AA of FIG. FIG. 3 is an operation explanatory view of an infrared sensor using a sectional view. The enlarged view for explanation of the infrared sensor part which shows a reference position. An enlarged view for explaining an infrared sensor showing an end point position. An enlarged view for explaining an infrared sensor showing a state in which the observation window is closed. Explanatory drawing showing the positional relationship between the table plate and the weight sensor The control block diagram explaining the control of the heating time of the cooking apparatus. Explanatory drawing explaining the field of view of the infrared sensor of the cooker.

Hereinafter, examples of the present invention will be described with reference to the accompanying drawings. 1 to 3 show the main part of this embodiment, FIG. 1 is a perspective view of the main body of the cooking cooker as viewed from the front side, and FIG. 2 is a rear side with the outer frame of the main body removed. The seen perspective view, FIG. 3, is a sectional view taken along the line AA of FIG.

In the figure, the main body 1 of the cooking cooker puts the food to be heated in the heating chamber 28, and cooks the food by using microwaves, the heat of the heater, and superheated steam.

The door 2 opens and closes to put food in and out of the heating chamber 28. By closing the door 2, the heating chamber 28 is sealed to prevent leakage of microwaves used when heating food. It traps the heat of the heater and superheated steam, making it possible to heat efficiently.

The handle 9 is attached to the door 2 to facilitate opening and closing of the door 2, and has a shape that is easy to hold by hand.

The glass window 3 is attached to the door 2 so that the state of food being cooked can be confirmed, and glass that can withstand high temperatures due to heat generated by a heater or the like is used.

The input means 71 is provided on the operation panel 4 on the lower front side of the door 2, and includes a heating means such as microwave heating and heater heating, an operation unit 6 for inputting a heating time and the like and a heating temperature, and an operation unit 6. It is composed of a display unit 5 that displays the content input from and the progress of cooking.

The outer frame 7 is a cabinet that covers the upper surface and the left and right side surfaces of the main body 1 of the cooking cooker.

The water tank 42 is a container for storing water necessary for producing superheated steam, is provided on the lower side of the front surface of the main body 1 of the cooking cooker, and has a structure that can be attached to and detached from the front surface of the main body 1 to supply water. And drainage is easy.

The rear plate 10 forms the rear surface of the cabinet described above, and an external exhaust duct 18 is attached to the upper portion thereof to cool the steam discharged from food and the internal parts of the main body 1 and then the cooling air (waste heat). 39 is discharged from the external exhaust port 8 of the external exhaust duct 18.

The machine room 20 is provided in a space between the bottom surface 28a of the heating chamber and the bottom plate 21 of the main body 1, and on the bottom plate 21, a magnetron 33 for heating food, a waveguide 47 connected to the magnetron 33, and the like. A control board 23 on which the control means 23a (see FIG. 10) is mounted, various other parts described later, a fan device 15 for cooling these various parts, and the like are attached.

The bottom surface 28a of the heating chamber has a substantially concave central portion, in which the rotating antenna 26 is installed, and the microwave energy radiated from the magnetron 33 penetrates the waveguide 47 and the output shaft 46a of the rotating antenna 26. It flows into the lower surface of the rotating antenna 26 through the opening portion 47a, is diffused by the rotating antenna 26, and is radiated into the heating chamber 28. The output shaft 46a of the rotating antenna 26 is connected to the rotating antenna driving means 46.

The fan device 15 includes a cooling fan attached to a cooling motor attached to the bottom plate 21. The cooling air 39 generated by the fan device 15 cools the self-heating magnetron 33, the inverter board (not shown), the weight sensor 25, and the like in the machine room 20. Further, it flows between the outside of the heating chamber 28 and the outer frame 7 and between the hot air case 11a and the rear plate 10, and is discharged from the external exhaust port 8 of the external exhaust duct 18 while cooling the outer frame 7 and the rear plate 10. .. Further, a duct 16a for cooling the hot air motor 13 described later and a duct 16b for cooling the infrared unit 50 housed in the infrared case 48 described later are provided, and the cooling air 39 for cooling the infrared unit 50 is provided. , After being discharged from the opposite side of the exhaust duct 28e that disposes of the exhaust heat (steam, etc.) in the heating chamber 28, it is discharged to the outside from the external exhaust duct 18.

The microwave oven heating means 330 (see FIG. 10) comprises a magnetron 33 and an inverter substrate (not shown), and is controlled by the control means 23a.

A hot air unit 11 is attached to the rear part of the heating chamber 28, a hot air fan 32 that efficiently circulates the air in the heating chamber 28 is attached to the hot air unit 11, and an air passage is provided on the rear wall surface 28b of the heating chamber 28. The hot air intake hole 31 and the hot air blowout hole 30 are provided.

The hot air fan 32 is rotated by being driven by a hot air motor 13 attached to the outside of the hot air case 11a, and heats the air circulated by the hot air heater 14.

Further, the hot air unit 11 is provided with a hot air case 11a on the rear side of the back wall surface 28b of the heating chamber, and the hot air heater 14 is located between the back wall surface 28b of the heating chamber and the hot air case 11a on the hot air fan 32 and its outer peripheral side. The hot air motor 13 is attached to the rear side of the hot air case 11a, and the motor shaft thereof is connected to the hot air fan 32 through a hole provided in the hot air case 11a.

The temperature of the hot air motor 13 rises due to the heat from the heating chamber 28 and the hot air heater 14, and in order to prevent this, the hot air motor 13 is surrounded by the hot air motor cover 17 and is formed in a substantially tubular shape to form a duct 16a with the hot air case 11a and the rear plate 10. The upper end opening of the duct 16a is connected to the lower surface of the hot air motor cover 17, the lower end opening is connected to the outlet of the fan device 15, and a part of the cooling air 39 from the fan device 15 is connected to the hot air. It is incorporated into the motor cover 17.

A grill heating means 12 including a heater is attached to the back side of the top surface 28c of the heating chamber 28. The grill heating means 12 winds a heater wire around a mica plate to form a flat surface, presses it against the back side of the top surface of the heating chamber 28 to fix it, and heats the top surface of the heating chamber 28 to heat the food in the heating chamber 28. It is baked by radiant heat.

Further, an infrared unit 50, which will be described later, is provided behind the heating chamber top surface 28c of the heating chamber 28, is covered with an infrared case 48 to cool the infrared unit 50, and is formed in a substantially tubular shape to form a duct 16b. Located between the hot air case 11a and the rear plate 10, the upper end opening of the duct 16b is connected to the side surface of the infrared case 48, the lower end opening is connected to the upper surface of the hot air motor cover 17, and the cooling air from the fan device 15 is connected. I try to incorporate a part of 39.

A heating chamber temperature sensor 80 for detecting the heating chamber temperature TH1 of the atmosphere of the heating chamber 28 by a thermistor is provided on the left back side of the heating chamber top surface 28c of the heating chamber 28.

Further, a weight sensor 25 for measuring the weight of the object to be heated 60c is provided on the bottom surface 28a of the heating chamber. A table plate 24 for placing the object to be heated 60c is placed on the weight sensor 25, and the weight of the table plate 24 is tare-pulled to detect the weight of the object to be heated 60c. However, the weight sensor 25 has a support portion 25a on the left side, a support portion 25b (FIG. 8) on the right side, and a rear side supporting the left and right ends (left and right corner portions) of the front side (door 2) of the square table plate 24. It is composed of a support portion 25c that supports the central portion on the side, and a weight sensor for detecting the weight of the object to be heated 60c is provided in any one of the support portions. In this description, a weight sensor is provided on the support portion 25c at the central portion on the rear side.

The table plate 24 is for placing food, and is formed of a material having heat resistance and good microwave transparency so that it can be used for both heater heating and microwave heating. In addition, a flange portion 24b (including a rising wall 24a) that makes it easy to hold is provided around the periphery. Furthermore, by providing the flange portion 24b (including the rising wall 24a), dirt stays on the table plate 24 even if a drink is spilled when taking in or out the object to be heated during heating, and the table plate 24 can be cleaned by removing it. It's easy.

The boiler 43 is attached to the outer surface of the hot air case 11a of the hot air unit 11, and the saturated steam is brought into the hot air unit 11, and the saturated steam ejected into the hot air unit 11 is heated by the hot air heater 14 to become superheated steam.

The pump means 87 pumps water from the water tank 42 to the boiler 43, and includes a pump and a motor for driving the pump. The amount of water supplied to the boiler 43 is adjusted by the ON / OFF ratio of the motor.

The heating means includes a microwave oven heating means 330, a hot air heater 14, a hot air motor 13, a grill heating means 12, a boiler 43, and the like.

Next, the infrared sensor for detecting the temperature of the object to be heated in a non-contact manner provided above the heating chamber 28 will be described in detail with reference to FIGS. 4 to 7.

Reference numeral 51 denotes a motor, which is attached so that the direction of the motor 51 is parallel to the rotating shaft 51a and the back wall surface 28b of the heating chamber. Then, the rotating shaft 51a rotates (drives) the tubular unit case 54, which will be described later, to rotate the substrate 53 on which the infrared sensor 52 is housed in the unit case 54, and to orient the lens portion 52a of the infrared sensor 52. The temperature can be detected by rotating the range from the back side of the bottom surface 28a of the heating chamber (the back wall surface 28b side of the heating chamber) to the opening 28d of the heating chamber. The motor 51 uses a stepping motor and is capable of rotating the rotating shaft 51a in the forward and reverse directions and operating at a desired rotation angle by controlling the control means 23a provided on the control board 23.

Reference numeral 52 denotes an infrared sensor, which is provided with a plurality of infrared detection elements (for example, a thermopile). Here, an infrared sensor in which eight elements are arranged in a row in the vertical direction of the rotating shaft 51a is used. Therefore, it is possible to detect the temperatures of the plurality of locations at once in the left-right direction of the bottom surface 28a of the heating chamber, and an infrared sensor is provided from the back side (back wall surface 28b side of the heating chamber) to the front side (door 2 side) of the heating chamber 28. By rotating 52, the entire area of the bottom surface 28a of the heating chamber is divided into a plurality of parts to detect the temperature. Specifically, the temperature of the entire surface of the table plate 24 placed on the bottom surface 28a of the heating chamber is detected.

The infrared sensor 52 is provided at substantially the center in the left-right direction of the heating chamber top surface 28c inside the virtual line extending perpendicularly to the heating chamber top surface 28c from the four sides of the table plate 24 placed on the heating chamber bottom surface 28a. There is.

The field of view of the infrared sensor 52 is defined so that the detection points a and h are within a range for detecting the temperature of the flange portions 24b before and after the table plate 24, and the sensors on both sides of the plurality of elements aligned with the infrared sensor 52 are tables. The range for detecting the temperature of the left and right flange portions 24b of the plate 24 is substantially defined. By doing so, it becomes possible to accurately detect the temperature of the object to be heated 60c placed substantially in the center of the table plate 24.

Reference numeral 54 denotes a tubular unit case, which is provided with a window portion 54a in which the substrate 53 is arranged in the maximum diameter portion and the lens portion 52a of the infrared sensor 52 faces. Further, by including carbon in the material of the unit case 54, the characteristic of the unit case 54 is made into a conductive material, so that external noise is prevented from entering the unit case 54.

Reference numeral 55 denotes a shutter made of a metal plate. The shutter 55 closes the observation window 44a, which will be described later, when the infrared sensor 52 is not used (see FIG. 7). Further, in order to prevent the temperature of the heating chamber 28 from being transmitted to the unit case 53, an air passage 55c having a gap is formed along the outer circumference of the unit case 54 so that the cooling air can flow to the outer circumference of the unit case 53. A shutter 55 is arranged in the air passage 55c, and an opening 55a and an opening 55b serving as an entrance / exit for cooling air 39 to flow are provided in the air passage 55c.

Reference numeral 56 denotes a positioning convex portion, which is a reference position of the detection point of the infrared sensor 52 when the control unit controls the rotation of the motor 51 so as to align the detection point of the infrared sensor 52 with the reference position (detection point a in FIG. 4). When the observation window 44a is closed by the shutter 55, the rotating shaft 51a is slipped in a state where the positioning convex portion 56 is in contact with a stopper (not shown) provided on the infrared case 48. It is possible to correct the reference position controlled by the control unit and the position of the detection point a which is the reference position detected by the infrared sensor 52.

Reference numeral 44 denotes an arc-shaped observation unit discharged inward of the heating chamber 28, which is provided along the center of rotation of the rotating shaft 51a, the center of the tubular unit case 54, and the outer circumference of the unit case 54 and is bent in an arc shape. The center of the arc of the shutter 55 and the center positions of the arc-shaped observation unit 44 are all at the same position. Reference numeral 44a is an observation window provided in the observation unit 44, which opens a range to be a viewing range detected by the infrared sensor 52. Further, in order to prevent microwave leakage from the observation window 44a during microwave heating, a rising wall (burring) 44b of about 2 mm is provided on the outer side around the observation window 44a.

By projecting the observation unit 44 inside the heating chamber 28, it is possible to detect a wide range of temperatures within the minimum narrow observation window opening range.

Reference numeral 49 denotes a convex portion, which separates the infrared case 48 and the infrared unit 50 from the heating chamber top surface 28c. By making contact with the heating chamber top surface 28c only at the convex portion 49, the grill heating means 12 and hot air are used during heating. The temperature of the top surface 28c of the heating chamber heated by the heater such as the unit 11 is not easily transmitted to the infrared unit 50.

The measurement procedure of the infrared sensor 52 of the control means 23a mounted on the control board 23 will be described.

The infrared sensor 52 uses the motor 51 to measure eight points in one measurement, and the infrared sensor 52 is rotated 14 times by 3 degrees from the reference position (FIG. 4, detection point a) to the end point position (FIG. 4, detection point h). , A total of 15 rows of measurements are performed by rotating and moving.

Then, the temperature is detected at 120 points in 8 points in the left-right direction and 15 rows in the front-rear direction. From the end point position to the reference position, the infrared sensor 52 directly returns to the reference position without measuring. The processing of the measured temperature will be described later.

Next, the rotational movement of the infrared sensor 52 will be described.

As an example of a container 60 having an open upper part containing a object to be heated (milk) 60c, when a cup is placed on a table plate 24 provided on the bottom surface 28a of the heating chamber and heating is started, the magnetron 33 stably transmits. The observation window 44a is closed by the shutter 55 for 1 to 2 seconds (see FIG. 7) to prevent noise due to unstable transmission at the start of transmission of the magnetron 33 from entering the infrared sensor 52.

After the transmission of the magnetron 33 is stable, the control means 23a controls the rotation shaft 51a of the motor 51 to rotate to the reference position. The rotation shaft 51a rotates to the reference position to rotate the unit case 54, and the direction of the lens portion 52a of the infrared sensor 52 also rotates to a position where the detection point a at the reference position can be detected. At this time, the cooling air 39 flows through the lens portion 52a of the infrared sensor 52 and flows from the sensor window portion 44a to the heating chamber 28, so that dirt is prevented from adhering to the lens portion 52a.

By rotating the unit case 54, the temperature detection of the object to be heated 60c proceeds from the above-mentioned reference position (detection point a) to the detection points b and c of the table plate 24, and when the unit case 54 further rotates. The temperature outside the cup (container 60) is detected in the height direction, and the temperature at the detection point e is detected from the detection point d. After the detection point reaches the apex of the opening of the cup (container 60), the temperature of the surface of the object to be heated 60c is detected at the detection point f, and then the temperature inside the cup (container 60) is detected at the detection point g. Then, the temperature of the table plate 24 is detected at the end point of the detection point h.

The temperature in the temperature detection range from the detection point a to the detection point h is detected by one of the outward paths that rotate the unit case 54, and after the temperature is detected once to the end point, the temperature is detected without measuring in the middle of the return path. Instead, after returning to the reference position again, the detection points a to h are sequentially performed.

The number of detected temperatures can be changed to a preference, and the above-mentioned detection points a to h are explanatory examples, and 15 columns of data are measured as described above.

Further, the temperature is detected by stopping the rotation of the motor 51 while the temperature is being detected, and then rotating after the detection. In order to detect the temperature accurately, the rotation is stopped and the measurement is performed.

For example, at the beginning of heating, the rotation of the unit case 54 is stopped and detected, and after the detection, the rotation is performed at a constant angle, the rotation is stopped and detected, and after the detection, the rotation is performed at a constant angle. Measure the temperature distribution. By doing so, the entire surface of the table plate 24 of the heating chamber 28 is measured evenly by measuring the temperature at a fixed position at an equal angle.

With such a setting, when the cup 60 is placed on the back side of the table plate 24, the temperature of the object to be heated 60c in the cup can be detected at the detection point b substantially below the infrared sensor 50, and the cup 60 can be detected. When the infrared sensor 50 is placed on one of the left and right sides of the table plate 24, the infrared sensor 50 is provided substantially in the center of the heating chamber 28 in the left-right lateral direction, so that the infrared sensors 50 are aligned in a row provided in the infrared sensor 50. The temperature of the object to be heated 60c can be detected by the infrared sensors on both sides of the eight elements.

Further, when the weight information is light and the temperature rise of the temperature distribution is recognized in a wide range from the weight information by the weight sensor 25 and the temperature distribution information detected by the infrared sensor 52, it can be determined that the object to be heated 60c is thin and wide. Further, when the weight information is heavy and the temperature rise of the temperature distribution is observed only in a narrow range, it can be determined that the object to be heated 60c is put in, for example, a tall cup (container 60).

In this embodiment, the infrared unit 50 is provided on the back side of the heating chamber top surface 28c, but the position where the infrared unit 50 is attached is the same as described above even when the infrared unit 50 is attached to the central portion or the front side of the heating chamber top surface 28c. If installed based on the idea, the temperature of the object to be heated 60c can be accurately detected.

Further, in this embodiment, the method of detecting the temperature of the object to be heated 60c placed in the cup 60 has been described in detail, but even when the object to be heated 60c without using a container is a large block-shaped mass, the block-shaped object to be heated is heated. Since the height direction of the side surface and the temperature of the upper surface of the object 60c can be detected, the temperature distribution of the object 60c to be heated can be detected in detail.

Next, processing of the temperature measured by the infrared sensor 52 of the control means 23a will be described.

First, a problem when detecting the temperature of the object to be heated 60c by using the infrared sensor 52 will be described.

Even if the temperature of the object to be heated 60c is the same, the infrared sensor 52 has a different detection temperature due to the difference in emissivity. Further, in the data output from one infrared sensor 52, the temperature of the object to be measured in the field of view of the infrared sensor 52 is output as a substantially average value, so that the object to be measured (object to be heated) and the table in the field of view When the plate 24 is present, the average value of the temperatures corresponding to each area of the object to be measured (object to be heated) and the table plate 24 is output.

The former difference in emissivity can be appropriately corrected by setting it according to the menu that can be input by the input means 71.

Next, the latter temperature detection of the object to be heated 60c will be described in detail.

In the infrared sensor 52, a plurality of (for example, 8 elements) infrared sensors 52 are arranged in a row as described above so that the substantially size and outer shape of the object to be heated 60c can be recognized, and the infrared sensors 52 are arranged three times each. By moving 14 times and measuring the temperature in 15 rows, a total of 120 (8 × 15) temperature data is acquired in the table plate 24.

The acquired 120 temperature data have the arrangement shown in FIG. Each of the 120 squares shown in the figure is called a pixel. This pixel is set at a viewing angle having about 50% or more of the directivity of the infrared sensor 52. However, the output from the infrared sensor 52 includes the following, which are all the objects to be measured included in the visual field (viewing angle 100%). A pixel having a viewing angle of 50% or more of the directivity, a plurality of pixels adjacent to the pixel, and a wall surface of a heating chamber 28 other than the table plate 24 are also included. Therefore, it is necessary to correct the detected temperature and substantially calculate the temperature of the object to be heated 60c.

The information required for the correction is the temperature of the wall surface of the table plate 24 and the heating chamber 28, the size of the object to be heated 60c recognized (determination) of the object to be heated 60c, and the temperature of the object to be heated 60c.

First, the temperatures of the wall surfaces of the table plate 24 and the heating chamber 28 described above will be described. In the cooking device, since the table plate 24 is always put in the heating chamber 28, the temperature of the wall surface can be recognized as the same by detecting the temperature of the table plate 24. If the difference between the temperature detected by using the heating chamber temperature sensor 80 and the temperature of the table plate 24 detected by the infrared sensor 52 is large, they may be corrected as separate temperatures.

Regarding the detection of the temperature of the table plate 24, the temperature of the flange portion 24b (including the rising wall 24a) of the table plate 24 is detected and used as the temperature of the table plate 24. Since the object to be heated 60c or the like cannot be placed on the flange portion 24b (including the rising wall 24a), the temperature of the table plate 24 can be accurately detected. The temperature of 42 pixels on the outer circumference shown in FIG. 10 is the place where the temperature of the table plate 24 is detected.

Next, the method of recognizing the object to be heated 60c, the size of the object to be heated 60c recognized, and the temperature of the recognized object 60c to be heated will be described.

In the recognition of the object to be heated 60c, pixels having a specific temperature difference with respect to the temperature of the table plate 24 described above are determined as the object to be heated 60c. However, since the object to be heated 60c may have a wide range of temperatures such as freezing, refrigerating, and room temperature, the following determination method is used to recognize the object to be heated 60c.

Since the cooker is mainly placed in the kitchen, it will be the same temperature as room temperature except immediately after it is used for heating.

When the object to be heated is frozen or refrigerated, the temperature of the object to be heated 60c is lower than the temperature of the table plate 24. In order to accurately recognize the object to be heated 60c, it is determined that the object to be heated 60c is recognized when the minimum temperature of each detected pixel is lower than the temperature of the table plate 24 by a specific temperature. The size of the object to be heated 60c is a collection of pixels indicating the temperature included in the previously confirmed temperature range corresponding to the difference between the temperature of the table plate 24 and the minimum temperature from the minimum temperature. It is recognized as the size of the object to be heated 60c. Then, the minimum temperature is recognized as the temperature of the object to be heated 60c, the detected temperature of the object to be heated 60c is corrected, and the temperature is calculated and derived as the initial temperature of the object to be heated 60c.

When the object to be heated 60c is higher than the temperature of the table plate 24, in order to accurately recognize the object to be heated 60c, the object to be heated is when the maximum temperature of each detected pixel is a specific temperature higher than the temperature of the table plate 24. It is determined that 60c has been recognized. The size of the object to be heated 60c is a collection of pixels indicating the temperature included in the previously confirmed temperature range corresponding to the difference between the maximum temperature and the temperature of the table plate 24 from the maximum temperature. It is recognized as the size of the object to be heated 60c. Then, the maximum temperature is recognized as the temperature of the object to be heated 60c, the detected temperature of the object to be heated 60c is corrected, and the temperature is calculated and derived as the initial temperature of the object to be heated 60c.

When the object to be heated 60c is at room temperature, the temperature of the table plate 24 and the temperature of the object to be heated 60c are equal. Therefore, there is a case where a specific temperature difference cannot be obtained between the detected temperature of each pixel and the temperature of the table plate 24. Specifically, it is determined on either side of a specific temperature difference assuming that the object to be heated 60c is frozen or refrigerated, or a temperature difference assuming that the object to be heated 60c is higher than the temperature of the table plate 24. If not, the entire area of the table plate 24 is recognized as the object to be heated 60c. Then, the temperature rises by heating the object to be heated 60c, the temperature at the position where this temperature rises above a specific temperature is re-recognized as the detection temperature of the object to be heated 60c, and the pixel in which the specific temperature has risen is recognized. The collected material is re-recognized as the size of the object to be heated 60c. It is derived by correcting the detected temperature of the object to be heated 60c and calculating it as the initial temperature of the object to be heated 60c.

Next, a configuration for detecting the weight of the object to be heated by using the weight sensor 25 will be described.

The table plate 24 placed on the weight sensor 25 has a rectangular shape long in the lateral direction, and the weight sensor 25 on which the table plate 24 is placed and supported supports the square table plate 24 at three places. There is. The support points are supported by the left and right end portions (left and right corner portions) on the front side (door side) and the center portion on the rear side side, and the support portions 25a and support portions 25b provided on the left and right end portions on the front side are provided with weight sensors. There is no support part, and the weight sensor is provided on the support part 25c provided in the central part on the rear side.

The above-mentioned support position has a relationship in which the support portion 25a and the support portion 25b are set as one side, and the support portion 25c is located on a vertical line from the position where the one side is bisected. Then, the center 25e of the quadrangle 25d whose one side is the long side (X0) and the position where the long side is bisected to the support portion 25c is the short side (Y0) coincides with the center 24c of the table plate 24. The positional relationship is set.

Based on the arrangement relationship between the weight sensor 25 and the table plate 24 described above, when the center 24c of the table plate 24 and the center of gravity of the object to be heated 60c are placed so as to coincide with each other, the weight of the object to be heated 60c is placed on the support portion 25a. 25% of the weight, the support portion 25b is loaded with 25% of the weight of the object to be heated 60c, and the support portion 25c is loaded with 50% of the weight of the object to be heated 60c.

Further, when the position of the center of gravity of the object to be heated 60c is moved from the center 24c described above to the support portion 25c side along the center line 24y, the loads applied to the support portion 25a and the support portion 25b maintain the same relationship and are the total value. Decreases, and the load applied to the support 25c increases. Further, when the position of the center of gravity of the object to be heated 60c is moved from the above-mentioned center 24c to the left side (support portion 25a side) of the drawing along the center line 24x, the load applied to the support portion 25c does not change and the support portion 25a The load of the support portion 25b increases and the load of the support portion 25b decreases. However, in any case, the total load applied to the support portions at the three locations shows the same value as the weight of the object to be heated 60c (the weight of the table plate 24 is tare).

Therefore, for example, the weight G of the object to be heated 60c can be calculated by knowing the position of the center of gravity (X1, Y1) of the object to be heated 60c and the load C detected by the support portion 25c. The origin that serves as a reference for the position of the center of gravity to be measured is the rear left corner of the quadrangle 25d.

The calculation formula is G = (Y0 / (Y0-Y1)) × C.

Next, a method of detecting the position of the center of gravity of the object to be heated 60c will be described.

Since the position of the center of gravity of the object to be heated 60c cannot be determined exactly, the position of the center of the object to be heated 60c is determined to be the position of the center of gravity.

The reason why the center position of the object to be heated 60c can be replaced with the position of the center of gravity is that the center of gravity of the object to be heated 60c approaches the center by performing a heating method for suppressing uneven heating in heating of the high frequency heating device.

Specifically, when freezing rice, prepare it into a flat shape with a thickness of 2 to 3 cm and a uniform thickness so that the frozen and stored food can be thawed and warmed well. Is explained in the instruction manual. For the same reason, as a heating method with less uneven heating (boiled) of vegetables, it is recommended to heat spinach and the like by alternately stacking stems and leaves. As a result, when these good heating methods are adopted, the center of the object to be heated and the center of gravity are substantially aligned.

Further, a mark (circle) 24d as a guide is provided in the central portion of the table plate 24 so that the object to be heated 60c can be easily placed in the central portion. By having the object to be heated 60c placed in this guideline, the weight error of the object to be heated can be reduced even if the center and the position of the center of gravity are different. Further, in order to further reduce the error, the guide mark (circle) 24d is long in the long side (X0) direction and short in the short side (Y0) direction of the quadrangle 25d that does not affect the calculation formula, for example, an ellipse or a quadrangle. But it's okay.

In order to obtain the center position of the object to be heated 60c, as described above, the aggregate of pixels detected by the infrared sensor 52 is recognized as the object to be heated 60c, the center position of the pixel aggregate is calculated, and the above calculation formula is used. It is possible to calculate the weight of the object to be heated 60c by using it.

The size of the pixel recognized by the infrared sensor 52 is determined by the viewing angle of the infrared sensor 52 and the distance to the object to be heated 60c.

The area recognized by the infrared sensor 52 is also provided with a configuration in which the accuracy is improved in a direction that affects the above-mentioned calculation formula. As described above, the infrared sensor 52 used is provided with a plurality of infrared detection elements, and eight elements are arranged in a row in the vertical direction of the rotating shaft 51a for rotating the infrared sensor 52. The number and arrangement of these elements are determined by the component manufacturer and cannot be changed when standard components are used. Therefore, the infrared sensor 52 is rotated in the short side (Y0) direction of the quadrangle 25d, which affects the calculation formula, so that the detection accuracy is improved.

For example, the orientation of the plurality of elements arranged in a row provided in the infrared sensor 52 and the vertical direction of the rotating shaft 51a for rotating the infrared sensor 52 are matched with the rotating shaft 51a of the motor 51 and the back wall surface 28b of the heating chamber. By mounting them in parallel, the temperature is detected at once by a plurality of elements in the left-right direction of the bottom surface 28a of the heating chamber, and from the back side (back wall surface 28b side of the heating chamber) to the front side (door 2 side) of the heating chamber 28. Detects the temperature of the entire surface of the table plate 24 placed on the bottom surface 28a of the heating chamber by rotating the infrared sensor 52.

In the left-right direction of the bottom surface 28a of the heating chamber, the length of the pixel recognized as an object to be heated changes according to the distance between the element of the infrared sensor 52 and the bottom surface 28a of the heating chamber, and the pixel to be detected increases as this length increases. The length of one side becomes long, and the accuracy of temperature detection of the object to be heated deteriorates. From the back side (the back wall surface 28b side of the heating chamber) to the front side (door 2 side) of the heating chamber 28, the length of one side of the pixel recognized as the object to be heated changes according to the rotation angle of the infrared sensor 52. When the rotation angle is reduced, the length of one side of the pixel is reduced, and the accuracy of recognizing the size of the object to be heated is improved.

FIG. 9 is a control block diagram for controlling the high-frequency heating cooker, in which the input means 71 inputs a key for determining a menu to the control means 23a and starting heating. The heating chamber temperature sensor 80 detects the temperature of the heating chamber 28, the infrared sensor 52 detects the temperature and size of the heated object 60c, and the weight sensor 25 detects the temperature and size of the heated object 60c placed on the table plate 24. It detects the load related to the mounting position. The control means 23a calculates the center position from the detected size of the object to be heated 60c, and calculates the weight of the object to be heated 60c from the calculated position and the load detected by the weight sensor 25. And the control means 23a controls the range heating means 330 from this weight.

With the configuration of the weight sensor 25 and the infrared sensor 52 described above, the weight of the object to be heated can be accurately obtained. The position of supporting the table plate 24 may be opposite to that of the present embodiment. Further, the infrared sensor 52 may be rotated in the left-right direction by providing the support positions at the front-rear corners on the right side and the center of the left side of the table plate 24.

Next, the weight sensor 25 is provided on any two of the support portion 25a (front left corner portion), the support portion 25b (front right corner portion), and the support portion 25c (rear side center portion), and the infrared sensor 52 is provided. Is shown in the example where is placed in the center of the top surface. Specifically, the configuration will be described in which a weight sensor is provided on the support portion 25a and the support portion 25c.

In the case of the above configuration, the weight G of the object to be heated 60c can be determined by knowing the position of the center of gravity (X1, Y1) of the object to be heated 60c, the load A detected by the support portion 25a, and the load C detected by the support portion 25c. Can be calculated. The origin that serves as a reference for the position of the center of gravity to be measured is the rear left corner of the quadrangle 25d.
The calculation formula is G = (X0 / (X0-X1)) × (A + B / 2).

When the infrared sensor 52 determines the center of the object to be heated, the infrared sensor 52 should be provided above the mark 24d provided in the center of the table plate 24 so that the object to be heated can be detected from directly above. Can be improved.

According to the above-described embodiment, the weight of the object to be heated placed on the square table plate can be detected by using an infrared sensor and two or less weight sensors, and the cost can be reduced. A cooker can be provided.

1 ... heating cooker, 23a ... control means, 24 ... table plate, 25 ... weight sensor, 28 ... heating chamber, 33 ... magnetron, 52 ... infrared sensor, 60 ... container, 60c ... object to be heated, 71 ... input means, G ... weight

Claims (2)

A heating chamber for storing objects to be heated and
A microwave oven heating means having a magnetron for heating the object to be heated,
A square table plate provided at the bottom of the heating chamber on which the object to be heated is placed, and
And three support portions for supporting the table plate,
A weight sensor that detects the weight of the object to be heated and
An infrared sensor provided above the heating chamber that detects the temperature of the object to be heated in a non-contact manner,
An operation unit for selecting the microwave oven heating means and inputting heating conditions, an input means having a display unit for displaying the contents input from the operation unit and the progress state of cooking, and an input means.
And a control means for controlling the range heating means from the detection result of the infrared sensor and the weight sensor in accordance with an input from said input means,
The support portion is arranged at the left and right corner portions on the front side, which is the door side on which the object to be heated is taken in and out, and the central portion on the rear side.
The support portion provided at the left and right corner portions does not include the weight sensor, but the support portion provided at the central portion includes the weight sensor.
It said control means replaces the central position of the resulting detected temperature by Ri before Symbol object to be heated before Symbol infrared sensor to the center of gravity of the heated material, the load value detected by the weight sensor by said center-of-gravity position A heating cooker for calculating the weight of the object to be heated. A heating chamber for storing objects to be heated and
A microwave oven heating means having a magnetron for heating the object to be heated,
A square table plate provided at the bottom of the heating chamber on which the object to be heated is placed, and
And three support portions for supporting the table plate,
Two weight sensors that detect the weight of the object to be heated , and
An infrared sensor provided above the heating chamber that detects the temperature of the object to be heated in a non-contact manner,
An operation unit for selecting the microwave oven heating means and inputting heating conditions, an input means having a display unit for displaying the contents input from the operation unit and the progress state of cooking, and an input means.
And a control means for controlling the range heating means from the detection result of the infrared sensor and the weight sensor in accordance with an input from said input means,
The support portion is arranged at the left and right corner portions on the front side, which is the door side on which the object to be heated is taken in and out, and the central portion on the rear side.
The weight sensor is provided at any two of the left and right corners and the center.
It said control means replaces the central position of the resulting detected temperature by Ri before Symbol object to be heated before Symbol infrared sensor to the center of gravity of the heated product, one of the load values detected by the weight sensor and the other of said A heating cooker characterized in that the weight of the object to be heated is calculated from the load value detected by the weight sensor and the position of the center of gravity .

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